Gear-grinding device.



R. B. WEAyBR. GEAR GRINDINGDBVIeE. APPLICATION FILED APRJQ, 1911. 1,017,612, Patented Feb. 13,1912. v

l NN.

we Je@ ROBERIPB. WEAVER, 0F DETROIT, MICHGAN.

GEAR-GINDING DEVICE.

hormis.

Specification of Letters Patent. vPatented Feb. 13,1%?

Application filed April 12, 1911. Serial No. 620,568.

Aot the city ot Detroit, in the county of layne and State of Michigan, have invented anew and useful viiiprovenient in Gear- Grinding Devices, of which the following is a specification,

This invention relates to devices for grinding bevel and other toothed gears, and it has for its principal objects to produce a grinding machine by the use of which the high spots on the teeth and rubbing surfaces of intermeshing gears may be eliectually removed without ai'ecting the f low spots, whereby the rubbing or working faces are accurately shaped, and to attain certain adp vantages hereinafter more fully appearing.

ytained until the 'grinding isv finished.

'Journaled in lthe bearing portion 2 There Ahave been numerous devices arrangedor grinding bevel and other gears where the large gear being ground is driven directly by the pinion or companion gear also being ground, the rubbing faces of both of which are ground with eniery or other abrasive material sprinkled thereon. This, however, has notbeen a success, because it there is any irregularity in the spacing of the teeth, although` infinitesimal, it ismain In fact, it will at times grow worse. This invention, therefore, consists essentially in a" gear grinding machine having a pair of ac` curately cut driving or master gears which are meshed together snugly with no back lash, said master gears carrying the devices adapted to receive the internieshing gears to be ground. The invention further consists in the parts and in the arrangements and combinations of parts hereinafter describedand claimed.

-In the accompanying drawing 'which forms part of this specification and wherein like` symbols refer to like parts wherever they occur, the figure represents, partly in` vertical section and partly in elevation, a

machine adapted for grinding bevel gears in accordance with iny invention.

As illustrated in the drawing, the inachine comprises a yoke or frame lchaving two bearing portionsf2 and 3, respectively, arranged at right angles to each other. is a spindle4having on its inner end a bevel gear 5. The outer end portion vof the spindle 4 is screw-threaded, as ato, to receive an inand the portion adjacent to the gear 5 is also screw-threaded, as at 8, to receive a similar ring or collar 9. The rings 7 and 9'are adapted to bear respectively against the opposite ends of the bearing portion 2; and by adjusting said rings on lthe spindle 4 the latteris also adjusted lengthwise inA its bearing. I

The spindle 4 is bored axially vto receive a cylindrical shank portion or stu'd'p'f10 of a. gear-holder which is splined or fea-therkeyed to rotate fixedly therewith, but permitted independent eiidwise movement. The shank is provided on itsinner end with a faceplate or disk 11 having pins 12 adapt-ed to fit perforations in an annularportion 13 of a bevel gear 14 to be ground, as hereiner setv forth. The outer end portion 15 of thrshank 10 is reduced considerably in diaineter and is Arotatably fitted in a bearing sleeve 1G, while the extreme end portion 1T is further reduced and screw-threaded to receive a retaining nut cr'thrust collar 18.

VThe bearing sleeve f ,is-eXternally screwthreaded and securedin a screw-threaded bore in the split lower portion of a bracket extension 19 on'the yoke or frame 1; and a clamping bolt 2O is obviously provided on the split portion ofthe bracket extension 19 whereby the bearing sleeve may be securely held in position. By adjusting the bearing sleeve in ,and `out on thebracket extension 19, obviously the shank 10 carrying the faceplate or, disk 11 is also adjusted with re spect tothe spindle 4."

Journaled in the bearing 3 is a spindle 21 having on its inner end a bevel Apinion 22 adapted to mesh with` the master gearV It is to be here noted that thefgear and pinion V22 are accurately and correctly cut so as to lit snugly with no back lash. The

spindle 21 is `screw-threaded, as M23-and 24 to receive thrust -collars 25 and'26, respec-V tively, similar to the collars 7 and 9 which are provided on the above mentioned spindle 4. By adjusting the'respective colthe before mentioned shank`10. The inner end portion 29 projects beyond the pinion 22 and is tapered to receive a counterpart `axial taper bore or seat in a bevel pinion 30 `to be ground in vconnection withv the gear 14.' The extreme end `portion 31 of thev .shank or stud 28 is reduced and screwthreadedto receive a securing nut 32 adapted to clamp the pinion 30 on the taper 29.

The outer end portion 33 of. the shank or stud- 28 lis reduced' in diameterjand j ournaledv in a bearing sleeve 34 adjustably mounted in a bracket extension 35 of the frame 1 1 reduced and screw-threaded to receive a re- I in a manner similar to the-betere men-` tioned bearing sleeve 1G. The' extreme outer end portion 36 4of the shank'er is further taining nut or thrust collar '37.

The master gears may be driven by any suitable means, but a pulley 38 is preferably keyed onto the upper end portion lof the "abrasive spindle 21 which carries the pinion 22; and this pulley is driven by a .belt 39. The material may be dusted or sprinkled onto the gear teeth by hand or from a suitable chute; but it is preferable to place a-casing about the gears to be ground yto retainthe grinding material in contact with said gears.

Int-he operation of the machine, the gears to be ground are placed on the respective holders therefor, and the spindles for the master gear 5 and pinion 22 are adjusted in their bearings so that saidgear and pinion mesh with exact nicety and Without back lash. The respective bearing sleeves 16 -and t'are next adjusted inthe bracket extensions 19 and 35I .sothat the carriers for the gears to'be ground are adjusted with respect to the spindles of the master gears to bring said gears to be ground just so cldsely together that, When they are revolved,g.they touch on a iew ofthe' high spots of their rubbing faces. Then the abrasive material is applied to the gears or filled into the casing 40, as the case may be, and the gears are rotated together. The master gears being accurately cut and set in mesh Without any back lash, thegears which are to be ground are compelled to revolve at their correct velocity ratio, irrespective of any high spots 'or 10W spots,

` and the abrasive material acts upon the and correct velocity ratio between the two gears which have thus been ground. By this i arrangements shown.

method of grinding,.bevel and other gears.

are produced which are extremely accurate and quiet running.

HWhile the machine -illustrated in the. drawing is particularly adapted for bevel `gears, it is obvious that the invention is applicable. to any form or' intermeshing gearing in which one of the gear members is toothed, such as spur gears, spiral gearsl` and Wormk caring. Therefore, I do not Wish to be-llmited to the constructions and lfVhat I claim is: ".1, A machine for grinding toothed gears, comprising means for holding intermeshing gears to be ground in correct Working position, and -a positive driving device independent of said lntermeshing'gears for revolving them at their correct velocity ratio.

2. A machine for grinding toothed gears, comprising means' for' holding intermeshing `gears to be ground in correctvvorking position, means, external of. themselves, for re volving said gears at their correct velocity ratio, andimeans for maintaining abrasive material incontact with the coperating rubbing faces of said gears.

3. A machine for grinding toothed gears comprising rotatory means for holding `intermeshing gears to be ground in exactlvvorking position Withoutback lash, means, inde pendent of the gears .to be round, for r0- tating said rotatory .gear-ho ding meansv to l positively drive said gears to 4be ground at their correct velocity. ratlo, and meansy Ifor mamtamlng abrasive material 1n contact gears.

4. A machine for grinding toothed gears, comprising accurately formed intermeshing driving gears Without back lash, meansv for 'with the cooperating rubbingfacesof said mounting intermeshing gears to' be yground in iixed relation to therespective driving gears so as to be rotated positively there.-4

With, and means for adjusting-the gears being ground into closer mesh.

5. A machine for grinding toothedgears, comprising rotatory carriersfor intermeshing gears to be ground, and means for posiz tively driving said gear-carriers, comprising accurately fitting intermeshing gears Without back lash, whereby said gears to lbe ground are positivel'yidriven at their cor-v rect velocity ratio by mea-ns external of themselves.

6. A machine for grinding toothed bevel gears, comprising a cooperating pair of rotatory carriersadapted to hold an intermeshing pair of gears to be ground in correct' Working position, a pairof accurately cut beveled master gears fixed respectively on .said rotatory gear-carriers and set in mesh freeof back lash, and means for adjusting.

said rotatory gear-carriers Withrespect to each other yso as to bring the gears to be `ed to receive apair of ground into correct Working position and xwhereby said gears are driven at their correct velocit-y ratio.

7. A machine for grinding toothed bevel gears, comprising a pair of spindles having fixed thereon a pair of snugly fitting accurately out bevel gears Without back lash con stituting positive driving means therefor, and a pair of gear-carriers mounted axially on said spindles and respectively fixed to rotate therewith, but being adjustable length- Wise thereof, said gear-carriers being adaptintermeshing bevel gears to be ground. l

8. A machine for grinding toothed bevel gears, comprising a pair of spindles having fixed thereon a pair of snugly fittingaccurately cut bevel gears constituting positive driving means therefor, a pair of gear-carriers mounted axially on said spindles and respectively fixed to rotate therewith, but being adjustable lengthwise thereof, said gear-carriers being adapted to receive a pair of intermeshing bevel gears to be ground, and means for maintaining an abrasive material in contact with the cooperating rubbing faces lof said bevel gears being ground.

Signed at Detroit, Michigan, this 7th day of April, 1911. A

' ROBERT B. WEAVER.

Witnesses:

HERBERT'W. ALBEN, LESLIE WILLIAMS. 

